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Geophysical distribution of the pair of ionosondes (blue and green dots represent PUR and CMU, respectively), all-sky imager (red star), and the trace of the pair of Swarm A (the red solid line) and C (the magenta solid line) from ~13:03 UT to ~13:19 UT on 13 March 2015. The dotted backline represents the dip equator.
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